On Fri, 05 Aug 2011 10:04:56 -0700, Lee Zalaznik wrote: >On closer inspection the ground solder connection on the main >circuit looked like that the solder had not made complete contact with >the wire or had come lose.
I repaired a TR-7 a couple of years ago that had intermittent PTO operation. I eventually traced the fault to a solder connection on the PTO circuit board that looked just fine under casual inspection, but probing with an orage wood stick (handy item for a number of reasons) produced output. Under closer examination, the connecting wire poking out of the solder side looked like it was bent at an odd angle. The solder looked like it had flowed well around the connection, but the end of the wire was bent either from an impact during assembly, or possibly it was pulled when it was trimmed, fracturing the solder joint. It worked for who knows how many years that way, before it started to cause trouble. I see fractured connections at work quite frequently, caused by assemblers who get too happy with their cutters. Everyone was told at one time that we should trim the leads to length before soldering, but no one seems to do that. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
